Studies that evaluated the prevalence and the causes for PD referred primarily to obstetric trauma, such as vaginal tears, episiotomy, the mode of repair and damage to the pelvic floor muscles as probable causes for PD. These studies did not refer to estrogen deficiency and the possible effect of breastfeeding on vaginal atrophy and its contribution to PD. Comparison between vaginal deliveries and cesarean sections revealed that there is no difference in the prevalence of PD between the two groups, and according to these findings it can be assumed that the mechanical trauma to the vagina and pelvic floor during delivery is not the main cause for the development of PD.